Listing Windows users and groups in C#

This example is borrowed from a newsgroup post, apologies to whoever should take the credit but I lost the original url. It's a basic console application that prints out access lists and groups lists using WMI for the windows directory.

If you'd rather use the System.DirectoryServices namespace then there is a good example in the roadkill source.

using System;
using System.Management;
using System.Collections;

class Tester 
{
    [Flags]
    enum Mask : uint
    {
        FILE_READ_DATA = 0x00000001,
        FILE_WRITE_DATA = 0x00000002,
        FILE_APPEND_DATA = 0x00000004,
        FILE_READ_EA = 0x00000008,
        FILE_WRITE_EA = 0x00000010,
        FILE_EXECUTE = 0x00000020,
        FILE_DELETE_CHILD = 0x00000040,
        FILE_READ_ATTRIBUTES = 0x00000080,
        FILE_WRITE_ATTRIBUTES  = 0x00000100,

        DELETE = 0x00010000,
        READ_CONTROL = 0x00020000,
        WRITE_DAC = 0x00040000,
        WRITE_OWNER = 0x00080000,
        SYNCHRONIZE = 0x00100000,

        ACCESS_SYSTEM_SECURITY = 0x01000000,
        MAXIMUM_ALLOWED = 0x02000000,

        GENERIC_ALL = 0x10000000,
        GENERIC_EXECUTE= 0x20000000,
        GENERIC_WRITE = 0x40000000,
        GENERIC_READ = 0x80000000
    }

    public static void Main() 
    {
        try 
        {
            ManagementObject lfs = new ManagementObject(@"Win32_LogicalFileSecuritySetting.Path='c:\\windows'");
            // Dump all trustees (this includes owner)
            foreach (ManagementBaseObject b in lfs.GetRelated())
                Console.WriteLine("Trustees {0} is {1}", b["AccountName"], b["SID"]);
            // Get the security descriptor for this object
            ManagementBaseObject outP = lfs.InvokeMethod("GetSecurityDescriptor", null, null);
            if (((uint)(outP.Properties["ReturnValue"].Value)) == 0)
            {
                ManagementBaseObject Descriptor = ((ManagementBaseObject)(outP.Properties["Descriptor"].Value));
                DumpDescriptor(Descriptor);
                ManagementBaseObject[] DaclObject = ((ManagementBaseObject[])(Descriptor.Properties["Dacl"].Value));
                DumpACEs(DaclObject);
                ManagementBaseObject OwnerObject = ((ManagementBaseObject)(Descriptor.Properties["Owner"].Value));
                DumpOwnerProperties(OwnerObject.Properties); // Show owner properies
                ManagementBaseObject GroupObject = ((ManagementBaseObject)(Descriptor.Properties["Group"].Value));
                DumpGroup(GroupObject);
                ManagementBaseObject[] SaclObject = ((ManagementBaseObject[])(Descriptor.Properties["SACL"].Value));
                DumpSacl(SaclObject);
            }
        }
        catch(Exception e) 
        {
            Console.WriteLine(e);
        }

        Console.ReadLine();
    }

    static void DumpDescriptor(ManagementBaseObject Descriptor)
    {
        /* Win32_SecurityDescriptor
         ControlFlags
         DACL
         Group
         Owner
         SACL
         */
        Console.WriteLine(Descriptor.ClassPath);
        foreach(PropertyData pd in Descriptor.Properties)
            Console.WriteLine(pd.Name);
    }


    static void DumpACEs(ManagementBaseObject[] DaclObject)
    {
        // ACE masks see: winnt.h
        string[] filedesc = {"FILE_READ_DATA", "FILE_WRITE_DATA", "FILE_APPEND_DATA",  "FILE_READ_EA",
                                "FILE_WRITE_EA", "FILE_EXECUTE", "FILE_DELETE_CHILD", "FILE_READ_ATTRIBUTES",
                                "FILE_WRITE_ATTRIBUTES", " ", " ", " ",
                                " ", " ", " ", " ",
                                "DELETE ", "READ_CONTROL", "WRITE_DAC", "WRITE_OWNER",
                                "SYNCHRONIZE ", " ", " "," ",
                                "ACCESS_SYSTEM_SECURITY", "MAXIMUM_ALLOWED", " "," ",
                                "GENERIC_ALL", "GENERIC_EXECUTE", "GENERIC_WRITE","GENERIC_READ"};

        foreach(ManagementBaseObject mbo in DaclObject)
        {
            Console.WriteLine("-------------------------------------------------");
            Console.WriteLine("{0:X} - {1} - {2}", mbo["AccessMask"], mbo["AceFlags"], mbo["AceType"]);
            // Access allowed/denied ACE
            if(mbo["AceType"].ToString() == "1")
                Console.WriteLine("DENIED ACE TYPE");
            else
                Console.WriteLine("ALLOWED ACE TYPE");
            // Dump trustees
            ManagementBaseObject Trustee = ((ManagementBaseObject)(mbo["Trustee"]));
            Console.WriteLine("Name: {0} - Domain: {1} - SID {2}\n",
                Trustee.Properties["Name"].Value,
                Trustee.Properties["Domain"].Value,
                Trustee.Properties["SIDString"].Value);
            // Dump ACE mask in readable form
            UInt32 mask = (UInt32)mbo["AccessMask"];
            // using enum formatting (see emumerating the possibilities.doc)
            Console.WriteLine(System.Enum.Format(typeof(Mask), mask, "g"));


        }
    }
    static void DumpGroup(ManagementBaseObject Groups)
    {
        if(Groups != null) 
        {
            Console.WriteLine("=======================================");
            Console.WriteLine("Group property count : " + Groups.Properties.Count);
            foreach(PropertyData gd in Groups.Properties)
                Console.WriteLine(gd.Name + "\t\t " + gd.Value);
        }
        else
            Console.WriteLine("NO GROUPS Properties ");
    }
    static void DumpSacl(ManagementBaseObject[] SaclObject)
    {
        if(SaclObject == null)
            Console.WriteLine("No SACLs");
    }
    static void DumpOwnerProperties(PropertyDataCollection Owner)
    {
        Console.WriteLine("=============== Owner Properties ========================");
        Console.WriteLine();
        Console.WriteLine("Domain {0} \tName {1}",Owner["Domain"].Value, Owner["Name"].Value);
        Console.WriteLine("SID \t{0}",Owner["SidString"].Value);
    } 
}